Fastener-applying implement



June 25, 1935. A. H. MAYNARD 2,006,054

FASTENER APPLYING IMPLEMENT Filed May 5, 1953 2 Sheets-Sheet l 2 June25, 1935. A. H. MAYNARD 2,006,054 FASTENER APPLYING IMPLEMENT Filed May5, 1955 2 Sheets-Sheet 2 l'tlllllllI/IIIIIIII Patented June. 25, 1935UNITED STATES PATENT OFFICE- Boston Wire Stitche'r Company, Maine, acorporation of Maine Portland,

Application May 5, 1933, Serial No. 669,485

19 Claim.

This invention relates to improvements in fastener-applying implementsand particularly to a device constituted in the form of pliers adaptedfor manual operation to seize and hold the work and apply staples orfasteners of other type thereto.

One object of the invention is to provide an implement of the typeindicated having a mega zine for containing a supply of fasteners, meansfor holding and clamping the work to be operated upon, and means fordriving the fasteners through the work and clinching-them on the underside thereof.

7 Another object of the invention is to provide a .portable implement ofthe type indicated which is compact in size, light in weight andconvenient to hold and operate in the hand.

Another object of the invention is to provide an implement of the typeindicated which is simple in construction with its parts not liable toderangement or getting out of order and durable in use over longperiods.

Further objects of the improvement are set forth in the followingspecification which describes a' preferred form of construction of thedevice, by way of example, as illustrated by the accompanying drawings.In the drawings:

Fig. 1 is a side viewof the fastener-applying implement showing its jawsopened to receive the work;

I Fig. 2 is a similar view showing the main parts of the device insection on a median, longitudinal plane;

Fig. 3 is a plan view of the implement showing certain sections of itsparts as broken away to plement showing the door or gate for thestaple-- magazinein open position and illustrating-the detent-means forpreventing the staples from being ejected from the magazine when thegate opened;

Fig. 7 is a sectional plan view of the fore part of the staple-magazineshowing themeans for automatically operating the detent-pawls whichretain the staples in the magazine when the gate is opened;

Fig. 8 is a cross sectional view of the stapleple-head arrangedthereabove, mounted a reciprocable driver; one of said hanmagazine forcarrying a supply of staples; a staon which is dles carrying a jawadapted to hold and clamp the work beneath the stapling head and theother handle connected with means foractuating the driver to insert astaple through the work and clinch its legs against the under sidethereof.

The present implement is particularly designed to be constructed fromsheet-metal parts stamped out or struck up indies, whereby to render theimplement light in weight and economical to manufacture. The twohandle-members 2 and 3 may be of concave-convex form or- U- shaped incross-section with arched or rounded contours for providing a convenienthand hold. The two handles 2 and 3 are pivoted or hinged together on atransverse pin 5 extending through holes in their side walls, see Figs.3 and 4, and held in place by means as later-described. Also mounted onthe pivot-pin i is a bridge-plate or platform-shaped member "I, thedownwardly folded sides 8 of which abut the inner faces of the sidewalls of theupper handle-member 2.

The side walls of the. handle 2 straddle the walls of the lower handleit and the pivot-pin 5 is provided with spaced apart circumferentialgrooves 6, see Figs. 3, 4 and 5. A hairpin-shaped wire spring Ill isformed at one end with shepherd crooks ll adapted to snap around thepivotpin 5 to engage'in the grooves 6, the bight or loop at the oppositeend of the spring being seated against the curved wall of the lowerhandle-member 3. It will be understood that after the pivot-pin 5 hasbeen inserted through the holes in the side walls of the twohandlemembers 2 and 3 and the sides 8 of the bridgeplate I, the hooks orcrooks H on the spring II are snapped into the grooves 6 to abut thesides of the bridge-plate to prevent ax ial move-- ment of the pin.

The sides of the upper handle-member 2 are extended forwardly beyond thepivot-pin S in a jaw I! which carries a clincher-plate or anvil ii. .Asshown most clearly in Figs. 1 and 4, the anvil I5 is constituted by anupper plate I. restingacross the upper edges ll of i8 folded downwardlytherefrom to overlap the sides of the jaw. A pin I9 is riveted throughthe overlapping wings l8 and the sides of the jaw I2 to secure the partstogether. The upper plate "5 of the anvil I5 is inclined downwardlytowards its forward end to adapt it to assume a position perpendicularto the path of the staple-driver when the handle-members 2 and 3 areclosed together as shown in Fig. 5. The top of the plate I6 is formed atits forward end with clincher-grooves 21 of usual arrangement whichreceive the legs of the staple to bend them over against the under sideof the work.

Referring to Figs. 4 and 5 of the drawings, a helical spring 20 has oneend hooked around the pin IS in the jaw I2 and its opposite end attachedto a finger or lug 22 sheared from the bottom wall of the lower jawmember 3 and bent upwardly to provide a hook. The spring 20 is stretchedbetween the pin I 9 in the jaw 12 of the handle-member 2 and the lug 22on the handle-member 3, thereby tending to maintain the handles in openposition as illustrated in Fig. 1. of the drawings. The sides of thelower handle-member 3 are continued forwardly and upwardly from thepivot joint in a pair of arms or extensions 23 which are connected tooperate the staple-driver to be later described.

The staple-magazine 25 is constructed and arranged in the manner as nextdescribed. Re-

' ferring particularly to Figs. 3, 5 and 8 of the drawings, the magazinecomprises a tube or channel-member of substantially rectangularcross-section having a bottom 26, upstanding sides 21 and flanges 28folded inwardly from the sides to extend partly across the open top ofthe member. The bottom of the magazine 25 rests across the top of thebridge-plate l and is secured fixedly thereto by means of rivets 29 orother suitable means. In this location the center of the magazine isenclosed between the sides of the handle-members 2 and 3 with its endsprojecting rearwardly a distance substantially equal to the length ofthehandles and forwardly to a position above the jaw l2 on the handle 2.

Welded, riveted or otherwise suitably secured to the bottom of themagazine 25 is a staplecore 30 which extends longitudinally throughoutthe length thereof. The core 35 is formed with a bottom and upstandingsides 3!, across the top of which the staples s are alined in straddledrelationship with their legs received in the spaces between the "sidesof the core and the sides of the magazine; the flanges 2B overlappingthe heads or crossbar of the staples to hold them from rising up on thecore 35. The staples s are slid forwardly in the magazine to feed themsuccessively to' the staple-driver by means of a pusher slidable on thecore 30.

As shown most clearly in Figs. 2 and 8, the staple-pusher 35 consists ina sheet-metal channel-member having a top plate with sides 55 foldeddownwardly therefrom to straddle the sides of the core 30. Thestaple-pusher 35 is attached to a block 3'! fitted to slide within theupstanding sides 3! of the core 30 and serving to'take the propulsivethrust of a spring 35 which slides the pusher forwardly to feed thestaples in the magazine. The block 57 is connected to the pusher 35 bymeans of a finger- 55 sheared from the metal in the top portion thereofand bent downwardly to engage a slot 65 in the top of the block. Theblock 37! is guided in its sliding action by means of a rod H exthelateral walls of the jaw l2 and having wings.

tending longitudinally within the sides of the staple-core 30.

Referring to Figs. 2 and 9 of the drawings, the forward end of the rod4! is screw-threaded into a hole 42 in an end plate 43 which closes-theend of the core 30. The forward ends of the sides 3| of the ear 30 arerecessed at 44 with the bottom of the core projecting slightly forwardtherebeyond. The end-member 43 is formed with a transverse slot '45 intowhich the projecting edge of the bottom of the core 30 flts and thesides of the member are recessed'at 46 to receive the overhangingportions of the sides 3| of the core. The end-member 43 projects belowthe bottom of the core 30 at the front of the magazine to serve as anupper jaw-member for cooperation with the lower jaw l2. The end-member43 is provided with laterally projecting abutments or latches 41 at itssides, employed as a means for securing the gate, to be later described,which closes the end of the magazine. As illustrated most clearly inFig. 9 the abutments 41 are beveled off on their rearward sides for apurpose as later explained.

The rearward end of the magazine 25 is closed by a transverse plate 48which serves asthe anchoring means forthe rearward end of the rod 5!,see Fig. 3. The plate 48 extends across the open end of the magazine 25and is provided with narrow projections or lugs 59 fitted to slots 50 inthe edges of its sides 21, see Fig. l. A cylindrical nut 5i is insertedthrough a hole in the plate 48 and screwed onto the threaded end of therod M. The under side of the head of the nut 5i is beveled to seat inthe countersunk hole in the plate 48 with only the convex portion of thehead projecting therefrom, thus providing a substantially smooth finishfor the end of the magazine. If desired, the nut 5i may be made integralwith the rod ill or secured fast thereon as a convenience in screwingthe forward end of the rod into the hole in the front plate 53. When therod 5! is screwed tightly into the fr'ont plate 53 the two end platesare held flrmly in position at the opposite ends of the magazine 25. Thehelical pusher-spring 35, previously referred to, is coiled around therod 5|! between the nut 5| and the block 31 and maintained undercompression to slide the pusher 35 forwardly in the magazine 25 to feedthe staples s to the applying means.

A head or bonnet 541 for mounting the stapledriver and its operatingmechanism is constituted by a pair of vertical side plates 55 formedintegral with and. rising from the sides of the magazine 25. Fittedwithin the side plates or wings 55 is a, channel-shaped lining-member 55having its sides formed to substantially the same shape as the wings 55.Referring to Figs. 3 and 5, the lining member 55 has a bottom 51extending across the top of the staple-magazine 25 slightly above theupper edges of the sides of the core 35 with wings 58 folded upwardlytherefrom to abut the inner faces of the side plates 55. The forwardends of the main wings 55 are folded inwardly to provide verticallyextending flanges 59 at the front of the head 55 and the inner wings 58also have similar folded flanges 60 extending parallel with and spacedat a slight distance inwardly from the flanges 59, thus forming oppositegrooves or guideways M for the stapledriver 55. 1

The staple-driver 55 consists in a flat plate of hardened metal arrangedwith its lateral edges slidable in the guideways 5d of the head 55, see

duced or narrowed forward end6l projecting through a hole68 in thedriver, see Fig. 4. The

lever 66 is preferably of laminated structure, consisting of threeoverlying plates as 'shown' most clearly in Fig. 3. The lever 66 ispivoted on-a stud 18 extending through holes in the side plates or wings55 of the stapling head and through alining holes in the wings 58 of thelining member 56. One end of the pin I8 is reduced in diameter to form ashoulder II which abuts the inner face of one of the'side plates 55 andits opposite end has a still further reduced portion "I2 projectingbeyond the end which fits the hole in the opposite side plate 55. Thelocking means for the pin 18 consists in a flat strip or spring-arm I3pivoted on a rivet I4 secured in one of the main side plates 55. end ofthe arm I3 is formed with a hole 15 adapted to snap over the reduced end12 of the pin I8 to hold the latter in position; it being noted that bypryingthe arm 13 outwardly from the side of the plate 55 and swinging itto one side the end of the pin I8 may be released to permit of itswithdrawal. f

Extending longitudinally of the forward end of the lever 66 is a slot I8the sides of which are engaged by a roller 88 journalled on a pin 8|extending transversely between the sides of the arms or projections 23on the lower handlemember 3. The pin 8| is riveted through axial boresin a pair of washers 82 having reduced portions 83 fitted to holes inthe extension arms 23 of the handle-member 3. The roller 88 on the pin8| is adapted to traverse arcuate slots 84 in the sides 55 of the head54 and corresponding slots in the wings 58 of the lining member 56. Theslots 84 are concentric with the axis of the pin 5 on which thehandle-members 2 and 3 pivot and it will be observed that as the handlesare drawn together the roller 88 will be traveled in the slot 18 of thelever 66 to rock the latter downwardly toeffect the descent of thedriver 65 in the manner as later more fully explained.

The lever 66 is normally held in raised position, as shown in Fig. 2 ofthe drawings, under the tension of a spring 85. The spring 85 is ofsubstantially hairpin-shape having its opposite legs bent into loops 86which encircle the pivot-pin 18 and extend in reverse direction in theportions 81 engaging under .ears 88 on the lever 66. The ears 88 areformed integral with the outer plate laminations of the lever 66, beingbent outwardly therefrom to overhang the opposite sides of the lever.The ends of the portions '81 of the spring 85 are bent upwardly toengage around the forward edges of the cars 88. The forward loopportionof the spring 85 rests against a pin 89 which serves as a pivot for theswinging gate 98 arranged to close the forward end of the magazine 25.It should be mentioned that the spring 85 is ofgreater tension than thehelical spring 28 which functions to maintain the handle-members 2 and 3in open or separated relationship.

Through this provision .the initial pressure on the The oppositedownwardly to actuate the lever 66 to carry. the driver 65 down in thehead 54; this method of operationbeing more fully explained hereinafter.It is further noted that the opening movement of the jaw I2 is limitedby the engagement of the shoulders 4 at the forward end of the handle 2The pivot-pin 89 extends transversely through vertical slots 92 in theside plates 55 and 58 of the head 54 with its ends engaging in aliningholes in ears 93 at the ends of upright arms 94 carrying the gate 98. Itwill be noted by reference to Figs. 3 and 4 of the drawings, that thecentral portion of the pin" 89 is reduced in diameter, thus providingshoulders 9| which are engaged by the legs of the hairpin-shaped spring85, previously mentioned, to prevent axial movement of the pin. The pin\89 may be withdrawn from its hole by simply-lifting the end of thespring 85 to release it from the shoulders 9|.

Referring to Fig. 9 of the drawings, the gate 98 is of substantiallybox-shape having a front plate 95 and sides 96 forming a continuation ofthe arms 94. The sides 96 of the gate 98 are arranged to straddle thesides of the staple-core 38 with their rearward edges abutting theforward edges of the sides 21 of the magazine 25 when the gate is inclosed position as shown in Figs. 1 and 2. The gate 98 is locked inclosed position by means of notches 91 in the lower edges of its sides96 which engage over the beveled projections or abutments 41 on theend-member 43 at the end of the magazine 25. The rearward under faces ofthe sides 96 of the gate 98 are beveled at 98 to adapt them to slideeasily across thebeveled latches or abutments 41 when the withtherearward edges of the sides of the head tion under the pressure ofthe loop-portion of the spring 85 bearing against the pivot-pin 89.

It will be understood that the gate 98 is maintained closed against theforward end of the magazine 25 to prevent the staples s from feedingbeyond the lower edge of the driver 65 when thelatter is in raisedposition as shown in Fig. 2. With the gate in closed position its frontwall or plate 95 is spaced at a distance from the forward face of theend-member 43 on the core 38 to provide a narrow throat through whichthe stapledriver slides downwardly across the front of the core. It willbe noted by reference to Fig. 9 of the drawings that the gate 98 isnarrowed slightlyat its bottom to provide that is sides will exert aslight constrictive action on the staples to prevent them from droppingout of the machine when they are carried down below the top of thestaple-core.

To prevent the staples from being forcibly ejected from the magazine bytheaction of the pusher 35 when the gate or door 98 is swung into openposition, as shown'in Fig. 6, automaticallyoperated detent-means arearranged to engage with the staples at the forward end of the core 38.As herein shown the present detent-means comprises a pair of pawls I88pivoted on a transverse pin I8I riveted through the sides 'of theliningmember 56 in the head 54.. The pawls I88 are actuated by ahairpin-shaped spring I85 to engage their pointed toes I82 with theheads or crossbars of the staples as shown in Fig. 6. The upper loopedend of the spring I85 is seated against the inwardly bent flanges 60 ofthe lining-mernber 56 and the lower ends of the legs of the spring arebent around to engage in holes drilled into the edges of the pawls. Thepawls I00 have upstanding arms I01 which are located in the spacesbetween the sides of the lever 66 and the walls of the innerlining-member 55. The spring I05 acts to normally rock the pawls I00 toengage their pointed toes I02 with the heads of the staples s as shownin Fig. 6 when the gate is opened; and upon the closing of the gate thepawls are released from the staples by means as next described.

The side plates 55 of the head 54 and sides 58 of the lining-member 56are formed with horizontally-extending slots I08 through which the endsof a T-shaped slide IIO project, see Fig. 7 of the drawings. The slide II0 is adapted to slide in the slots I08 with its right-angle portion lIIprojecting between the sides of the two pawls I00. The slide H0 is slidforwardly in its slots I08 under the rocking action of the pawls I00,but when the gate 90 is closed down against the front of the magazine,as shown in Fig. 1 of the drawings, the rearward edges of the sides 96of the gate engage against the two ends of theslide III) to force thelatter rearwardly, whereby to rock the pawls I00 to disengage their toesfrom the staples s. In this way the closing of the gate acts to free thestaples to allow them to be fed forwardly under the propulsive action ofthe pusher 35. The construction and arrangement of the parts of theimplement having been described in detail its method of operation willnext be ,explained.

The magazine of the implement is loaded with staples by opening the dooror gate 90 and sliding a stick or refill along the core 30. To open thegate 90 it is only necessary to slide it upwardly to release the notches91 in its lower edges from the projection or abutments 4! on the member43 at the end of the core 30. As the gate is opened the slide IIO"'isreleased to allow the pawls I00 to be rocked by the spring I05 to carrytheir toes I02 downwardly against the top of the core 30. The staplestick or refill, comprising a plurality of the staples s cementedtogether by a frangible adhesive, is slid onto the core 30 to force thepusher 35 rearwardly against the tension of its spring"38; As thestaples are slid along the core 30 the pawls I00 act in ratchet fashionto engage successively with their heads to resist the pressure of thespring 38 tending to force the pusher 35 forwardly. After the refill hasbeen inserted into'the implement with the foremost staple in the stickbeneath the staple-driver 65 the gate 90 is closed down against thefront of the magazine 25. As the gate swings downwardly its bevelededges 98 slide across the latches 41 whereby to lift'the gate to allowthe'latches to engage-in its notches 91. As the gate is closed andlatched in this manner the edges of its side walls 96 engage against theslide I I0 to slide the latter rearwardly into the position shown inFig. 7 of the drawings. As the slide I I0 is moved rearwardly it acts torock the pawls I00 to release their pointed toes I02 from engagementwith the staples s. The machine is then ready for operation in themanher as next explained.

The handles 2 and 3 are grasped in the manner of pliers and pressureapplied thereto to rock the jaw I2 upwardly whereby to seize the work,indicated at w in Fig. 5, to clamp it against the under side of theend-member 43. Continued pressure on the handles causes the extensionarms 23. on the lower handle 3 to be rocked downwardly to traverse theroller 80, carried thereby, along the arcuate slots 84 in the sides ofthe head 54. The roller is thus traversed along the slot la in the lever66 to rock the latter downwardly.

. Actuation of the lever 66 causes the driver 65 to be slid downwardlyin the head 54 and as the lower edge'of the driver impinges against thetop of the foremost staple in the series this staple is separated fromthe stick to be carried down through the throat in the gate 90 anddriven into the work held on the anvil I5. As the legs of the stapleprotrude through the work-they enter the clincher-grooves 2I in theanvil I5 and are thereby bent over and clinched against the under sideof the work.

It has been explained that the spring is of greater tension than thespring 20 so that the jaw I2 moves towards the bottom of thestaplemagazine before the lever 66 is actuated. For the same reason, assoon as pressure on the handies 2 and 3 is relieved the lever 66 will berocked upwardly under the action of the spring 85 to raise thestaple-driver 65 in the head 54, the pin 89 serving as a stop to limitthe movement of the lever 66 in this direction. The raising of thedriver 55 permits the staple-stick to be slid forward under the actionof the pusher 35 to feed another staple into position abutting theforward wall of the gate 90 and underlying the bottom edge of thedriver. As the pressure on the handles 2 and 3 is further relieved thejaw I2 will be swung downwardly under the action of the spring 20 torelease the work so that it may be removed from the implement. Thedevice is then ready for another operation and may be used repeatedly inthe same manner to apply the staples or fasteners to the Work until thesupply in the magazine is' exhausted.

When the gate 90 is opened to replenish the supply of staples in themagazine 25 it releases the slide IIO, thereby permitting the pawls I00to be rocked downwardly so that should a few staples remain in themagazine their forcible ejection will be prevented.

It will be observed from the foregoing that the invention provides aparticularly compact implement embodying fastener-setting orstaple-applying means of the utmost simplicity and practically proofagainst derangement or getting out of order. The implement is convenientto load with staples, easyto operate, and efficient in action for thepurposes specified.

While the device is herein described and illustrated as embodied in apreferred form of construction, various modifications may be made in thestructure and arrangement of the parts thereof without departing fromthe spirit or scope of the invention. Therefore, without limitation inthis respect, I claim:

1. In a fastener-applying implement, the combination of a pair ofpivoted plier-handles, a reciprocable driver for driving the fastenersinto the work, a lever pivoted at one end and connected at its oppositeend tothe driver, and means on one 6f the handles engaging the lever ata point intermediate its ends and slidable longitudinally thereon torock the lever to reciprocate the driver.

2. In a fastener-applying implement, the combination of pivotedplier-handles, one of said handles carrying a jaw, a reciprocable driverfor inserting the fasteners through the work, a lever ivoted at one endwith its opposite end connected to the driver, said lever formed with aslot intermediate its ends, and means on the other handle slidable inthe slot in the lever to rock the latter to reciprocate the driver.

3. In a fastener-applying implement, the combination of a pair ofpivoted plier-handles, one of said handles having a jaw, a magazine forthe fasteners located opposite said jaw, a driver reciprocable withrespect to the magazine, means for feeding the fasteners in the magazineto deliver them successively to the driver, a lever pivoted at one endwith its opposite end connected to the driver, and means carried by theother handle engaging the lever at a point intermediate its ends andslidable longitudinally thereon to nected with the driver, and arrolleron the other handle engaging the lever intermediate its ends andslidable longitudinally thereon to rock, the latter to reciprocate thedriver.

5. In a fastener-applying implement, the bombination of a pair ofpivoted plier-handles, one of said handles being extended forwardly in ajaw and the other handle having a forwardly extended arm arrangedopposite the jaw, a reciprocable driver, a lever pivoted at one end withits.opposi te end connected to the driver, and means on'the forward-armof the second handle engaging the lever at a point intermediate its endsand slidable longitudinally thereon to rock the lever to reciprocate thedriver.

6.' In a fastener-applying implement, the combination of apair ofpivoted handles, one of said handles carrying a jaw and the oppositehandle bination of a pair of pivoted handles, one of said handles formedwith a jaw and the opposite handle having a forward extension, amagazine for the fasteners extending between the handles in oppositerelation to the jaw on one of them, a head fast on the magazine, adriver reciprocable on the head, means to feed the fasteners in themagazine to deliver them successively to the driver, a lever pivoted tothe head and connected to reciprocate the driver, said lever formed witha slot, and a roller carried by the extension on the second handle andengaging the slot in the lever to rock 'the latter to reciprocate thedriver.

8. In a fastener-applying implement, the combination of a pair ofpivoted handles, one of said handles extended forwardly in a jaw and theother handle extended forwardly in an arm, a magazine for the fastenerssupported on the pivot for the handles, a head on the magazinecomprising opposite side plates formed by extensions of the sides of themagazine, a driver reciprocable on said'head, a lever pivoted betweenthe side plates of the head and having a portion projecting through anopening in the driver, said lever formed with a slot, and a rollercarried by the arm on the second handle and engaging the slot in thelever to actuate the latter to reciprocate the driver.

9. In a fastener-applying implement, the combination of a pair ofpivoted handles, a magazine for the fasteners extending between thehandles, a head at the forward end of the magazine, a driverreciprocable on the head to operate on the fasteners fed thereto fromthe magazine, a lever pivoted to the head and connected to reciprocatethe driver, one of the handles, being provided with arms straddling thesides of the head, and means connecting said arms and slidably engagingthe lever to rock the latter to reciprocate the driver.

10. In a fastener-applying implement, the combination of a pair ofpivoted handles, a head, a driver reciprocable on the head, a leverpivoted to the head and connected with the driver, said lever formedwith a slot, one of the handles being provided with arms extendingforwardly from its pivot and straddling the sides of the head, a pinconnecting'said arms, and

' a roller on the pin engaging the slot in the lever to rock the latterto reciprocate the driver when the handles are moved relatively of eachother. ,11. In a fastener-applying implement, the combination of a pairof pivoted handles, a head, a driver reciprocable on the head, a leverpivoted to the head and engaging the driver, means connecting one of thehandles to actuate the lever to reciprocate the driver, a spring formaintaining the handles in open position, and a second spring acting onthe lever to return it. to initial position as the handles are returnedto open position by the first-named spring.

12. In an implement of the type indicatedthe combination of a head, adriver reoiprocable on said head, a lever pivoted to the head andconnected to reciprocate the driver, manually-opera ble means forrocking the lever, a spring looped around the pivot of the lever withone end anchored to means on the head and its opposite end engaging thelever to rock the latter, and means for limiting the rocking action ofthe lever under the tension of the spring.

13. In an implement of the type indicated, the combination of a headcomprising opposite side members, a driver reciprocable on said head, aI

pivot-pin extending between the sides of the head, a lever pivoted onsaid pin and connected to reciprocate the driver, manually-operablemeans for rocking the lever, a second pin extending between the sides ofthe head in position to limit the rock-.

ing motion ofthe lever in one direction, and a spring looped around thepivot-pin for the lever with one end held against the second pin and itsopposite end engaging the lever to rock the latter.

14. In an implement of the typeindicated, the

acting against the gate to normally maintain its notches in engagementwith the latches.

15. In an implement of the type indicated, the combination of a magazinefor containing a supply of fasteners, means for feeding the fasteners inthe magazine, means for operating on the fasteners assthey are fed fromthe magazine to apply them to the work, a gate for closing the end ofthe magazine, said gate formed with a detentnotch, a beveled latchengageable with the notch in the gate to retain the latter in closedposition, and a pin-and-slot connection for pivoting the gate to adaptits pivot to be displaced by moving the gate to release the notch fromthe latch to permit the gate to swing outwardly to open the magazine.

16. In an implement of the type indicated, the combination of a magazinefor containing a supply of fasteners, a head arranged above themagazine, said head being forrfied with vertical slots in its sides,fastener-applying means reciprocable on said head, means to feed thefasteners in the magazine to deliver them to the applying means, apivot-pin extending through the slots in the head, a gate pivoted onsaid pin and formed with a notch in its lower edge, a latch on themagazine engageable with the notch in the gate, and a spring actingagainst the pivot-pin for the gate to retain its notch in engagementwith the latch on the magazine.

17. In an implement of the type indicated, the combination offastener-applying means, a magazine for containing a supply offasteners, means for feeding the fasteners in the magazine to deliverthem successively to the applying means,

a gate for closing the end of the magazine, a pawl pivoted to adapt itto engage the fasteners in the magazine, means for operating the pawl toengage it with the fasteners to prevent their feeding movement when thegate is opened, and a slide engageable with the pawl to release it fromthe fasteners, said slide adapted to be moved by the gate when thelatter is closed against the magazine.

18. In an implement of the type indicated, the combination of a magazinefor containing a supply of fasteners, a head at one end of the magazine,fastener-applying means reciprocable on the head, means for feeding thefasteners in the magazine to deliver them successively to the applyingmeans, a pawl pivoted on the head and adapted to engage the fasteners toprevent them from fee-ding when the gate is opened, and a slide slidablein the head and adapted to be moved by the gate when the latter isclosed against the magazine, said slide acting to release the pawl fromthe fasteners.

19. In an implement of the type indicated, the combination of a head,fastener-applying means on said head, a magazine for containing a supplyof fasteners, means for feeding the fasteners in the magazine to deliverthem to the applying means on the head, said head formed with slots inits opposite sides, a slide extending through the slots in the head,detent-means in the head adapted to engage the fasteners to prevent themfrom feeding in the magazine, and a gate adapted to close against theend of the magazine and to engage the slide to move the latter torelease the detent-means from the fasteners.

ARTHUR H. MAYNARD.

